Plaster base



G. E. LAND PLASTER BASE April 12, 1932.

Filed May 1, 1929 i 4A 8 R I, I 2 m m /m N u E w I l I m 0 1 F 7 3 3w 3a ,5?

YIIIIIIIIIIIIIIIIII I I i VIIIIIIIIIIIIIIIII 11/ Patented Apr. 12, 1932UNITED sTATas PATENT, OFFICE GEORGE E.. LAND, OF PITTSBURGH,PENNSYLVANIA, ASSTGNOR, BY 'MESNE ASSIGN- MENTS, T MARY HAINES MARKS, OFSEWIC'KLEY, PENNSYLVANIA 'PLASTER BASE Application filed May 1, 1929.Serial No. 359,481.

applied thereto.

Where attempts have been made to use any one of the different formsofexpanded metal or metal screening having relatively large meshes forsupporting plaster, difficulty has been experienced in supporting theplaster or the like while in a semi-plastic state on the metal lathingor screening. In some constructionsa backing sheet has been placedbehind metal lath or screening for supporting the semi-plastic materialuntil it hardens. In such constructions it has heretoforebeen customaryto provide spacing strips between the composition board and the framingtimbers.

Thereafter the composition board is nailed to the spacing strips afterwhich the metallic lath or screening is usually fastened'to thecomposition board. Each of these operations is costly and it isdifficult to secure uniformity ofs'pa'cing and application of thedifferent parts of the base to the framing timbers unless especiallyskilled workmen are employed.

I provide a plaster base in theform of readily transportable sheetscomprising a backing sheet having corrugations formed thereinwhichserve'to space the sheet from the framing, timbers.

A metallic lath or screening is attached to the backing- For securingthe metal lath or screening to the backing, securingmeans, one form ofwhich is staples, are utilized whichare positioned to not only securethe metallic lath or screening to the backing, but also to preservethecorrugations in the backing itself. Sheets so prepared can betransported to abuirlding site and applied directly to framing timberswith but a single fastening operation.

The accompanying drawings illustrate certain present preferredembodiments :of the in V vent-ion in which 19.;

-Figure 1 is a broken elevational view of a body of plaster and aplaster base applied to framing timbers;

Figure 2' is a'sectional view thereof taken substantially along thesection line IIII of Figure l; and

Figures 3 to 8 inclusive are views illustrating several forms offastening devices applied to backing sheets.

Referring to Figures 1 and 2, a plaster base comprises a backing sheet 2having corrugations at formed therein, a fabric 5 for supporting a body6 of plaster or the like, and secur-' ing means, here illustrated in theform of staplesor wires 7, to secure the fabric 5 to the backingsheet 2.The staples are preferably placed with their inturned ends 8 disposed atopposite sides of the corrugations 4 so that the staples not only securethe fabric in place, but also tions.

The sheet 2 serves to support plaster orv the like when in asemi-plastic state. After the plaster or the like is hardened and thefabric is thoroughly imbedded therein, it is supported by the fabric andthe backin sheet has little work to perform. Accordingly,

commercial stiffening or reinforcing paper,

either chemically treated as by lcreosoting or the like, or plain, maybe used for the backing sheet 2. The thickness of the paper is such thatthe corrugations 4 have considerable resistance to bending so that theyserveto stiffen the plaster base and also to space the sheet 2 fromframing timbers 9 a distance substantially equal to that of commerciallaths." By so spacing the backing sheet 2,

the surface of the plaster is disposed at a dis tance from the timbers 9which is the same distance as where plaster is applied to wooden lath,This construction eliminates the Ire-- cessity forspecially spacing theinterior trim where my plaster base is used."

Thebase is secured "to the timbers by nails 10 drivenithroug h the base,preferably in the corrugations "4,With their outer ends clenched overthe fabric 5. iStiifeni-ng rods Ell laid in the corrugations 4, "ifdesired.

While I havei'llustrated a fabric 5' in the form of screening, it is tobe understood that different forms of metallic lath and expandmay bepreserve the shape of the corruga-' ed metal may be substituted thereforwithout departing from the spirit of the invention or the scope of theappended claims.

By the term plaster as herein employed, I contemplate the use of anymaterials which are appliedi to a wall in a semi-plastic state and whichharden into a solid condition.

Referring to Figure 3, a backing sheet 12 is provided with arectangularly shaped depression 13 which serves as a spacing corrugationin-the finished base. Staples or Wires 15, one of which is illustrated,are driven into the sheet 12 on opposite sides of the depression 13 withtheir ends 16 clenched so that the staples 15 serve to preserve theshape of the corrugation 13 and prevent the side walls thereof spreadingso that the effective depth of the corrugation is reduced.

. In'the modification shown in Figure 4, a backing sheet 17 is providedwith a rectangular shaped depression 18, the shape of which is preservedby a staple or wire 19 which has its ends 20 clenched into the sheet onopposite sides of the de ression 18. The intermediate portion of t estaple 19 is bent toconform to the shape of the depression orcorrugation. With this construction the upper surface of the corrugationis open, although thestaples 19 preserve its shape.

Referring to Figure 5, a sheet 21 is provided with a corrugation 22 inwhich a staple 23 is driven through one of the side walls of thecorrugation and the ends 24 of the staple are clenched over the outersurface of the opposite side wall.

In another form of the invention shown in Figure 6, a backing sheet 25is provided with a V-shaped corrugation 26, the shape of which isreinforced by a staple or wire 27 lying externally of the outer surfaceof the corrugation. The ends 28 of the staple extend through the sheet25 and are clenched over the opposite surface of the sheet.

Referring to Figure 7, a sheet 29 is pro-v vided with a rectangularlyshaped corrugation 30which is supported by an external staple or wire31, the ends 32 of which extend through the sheet 29 and are clenchedover the opposite surface.

' In Figure 8, I have illustrated a sheet 33.

having a V-shaped depression or corrugation 34 formed therein, the shapeof which is preserved by a staple 5 of greater height than the staple 7shown in Figure 2. The high staple 5 is used to span a stiffening rod 36of considerable diameter when such is placed in the corrugation 34 andalso to secure a fabric 37 in place. In addition the high staple permitsa greater quantity of plaster to be inserted between the fabric andbacking.

. It is to be understood that the securing device shown in Figures 3, 4and 6. to 8, inclusive, maybe used to preserve the shape of acorrugation and may also be used to secure a fabric layer to the backingin a manner corresponding to that shown in Figures 1 and 2.

While I have shown and described certain present preferred embodimentsof the invention, it is to be understood that it ma be otherwiseembodied within the spirit 0 the invention and the scope of the appendedclaims.

I claim 1. A plaster base comprising a paper backing sheet having aself-sustaining corrugation formed therein, a fabric overlying saidbacking sheet and a plurality of individual members for both securingthe fabric to the backing sheet and simultaneously preserving the widthof the trough of said cor rugation. I

2. A plaster base com rising a paper backing sheet having a selsustaining corrugation formed therein, a fabric overlying said backingsheet and stiffeners for securing the fabric to the backing sheet andsimultaneously additionally sustaining the shape of said corrugation.

3. A base for plaster comprising a paper backing sheet having aplurality of self-sustaining stiffening and spacing corrugations formedtherein, a sheet of fabric applied thereto andmeans for securing thefabric to the backing sheet at said corrugations whereby the securingmeans serves to strengthen the corrugations.

4. A base for plaster comprising a sheet of paper backing materialhaving self-sustaining corrugations formed therein, a sheet of fabricapplied thereto, reinforcing means disposed in at least one of saidcorrugations and means for securing the fabric to the backing sheet incooperation with said corrugations whereby the securing means serves tohelp preserve the shape of the corrugation and retain the reinforcingmeans in said corrugation.

5. A base for plaster comprising a flexible non-metallic sheet ofbacking material having corrugations formed therein, transversebacking-stiffening and plaster reinforcing members associated with saidbacking material, longitudinal backing-stiffening and plasterreinforcing members disposed in at least one of said corrugations, andmeans for securing the transverse members to the backing sheet incooperation with said lon 'tudinal members and said corrugations, wereby the securing means serves to preserve the shape of thecorrugations and retain the longitudinal members in position in saidcorrugations.

6. A base for plaster comprising a flexible non-metallic sheet ofbacking material having corrugations formed therein, transversebacking-stiffening and plaster reinforcing members associated with saidbacking sheet, longitudinal backing-stiffening and plaster reinforcingmembers disposed in at least one of said corrugations, and a reticulatedmetallic plaster reinforcing member disposed be tween said transverseand longitudinal members, all four members being secured together toform a unitary structure.

7 A base for plaster comprising a flexible non-metallic sheet of backingmaterial having corrugations formed therein, transversebacking-stiffening and plaster reinforcing members associated therewith,and means for securing the transverse members to the backing sheet incooperation with said corrugations, whereby the securingmeans serves topreserve the shape of the corrugations.

8. A base for plaster comprising a flexible non-metallic sheet ofbacking material having corrugations formed therein, a backingstiifeningand plaster reinforcing wire mesh covering the backing material,longitudinal backing-stifl'ening and plaster reinforcing membersdisposedin at least one of said corrugations, and means including individualstaples for securingthe wire screen to the backing material, incooperation with said longitudinal members, whereby the staples serve tohelp preserve the shape of the corrugations and retain the longitudinalmembers in said'corrugations.

9. A plaster base comprising a flexible backing having spaced, creased,self-sustaining corrugations forming stiffening ribs therein, a wiremesh overlying the paper backing on the side opposite the ribs and aplurality of spaced individual staples extending across the troughsofthe ribs, for both securing the fabric to the paper and maintaining theWidth of the trough.

my hand.

10. A plaster base comprising a backing sheet of paper havingcorrugations formed therein, said paper being of such stock that thecorrugations are substantially self-supporting longitudinally, plasterreinforcing means extending across said corrugations, andstaples forsecuring said means to the paper backing, said reinforcing means andsaid staples cooperating to preserve constant the width of thecorrugations.

In testimony whereof I have hereunto set GEORGE E.- LAND.

